I was wondering what are the most popular jobs performed by a landscaper (top three in rank), what types of jobs are the money makers and what certifications should I aquire before I start this company up. I have six months before I do this and want to be proficient by then with my business plan.

Also if you havn't noticed, this is my first question posted and if you think that I am asking the wrong questions then redirect me so that I move in the right direction...I'm like a sponge right now so go ahead and shoot!!